看拼音,写同音字。
wǎn
gù
xiá
cāng
____尔
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闲____
船____
____惜
照____
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坚____
____想
____茫
如图,⊙O过正方形ABCD的顶点A、B,且与CD相切,若正方形ABCD的边长为2,则⊙O的半径为( )
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同纬度的A地海拔400米,B地海拔1900米,当B地气温是3℃时,则A地气温是( )